大跨度简支钢桁梁大桥变形监测模型设计与优化分析

发布时间：2018-03-10 05:15

本文选题：变形监测　切入点：挠度　出处：《合肥工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：桥梁是交通运输网络的重要组成部分。当前我国工程建设快速发展。大跨度桥梁层出不穷,对桥梁工程质量水平提出了新的高度和要求。从上世纪五十年代,钢材冶炼技术快速提高,钢铁桥梁的建设取得了极快发展。目前,国内外钢结构桥梁的主要结构形式有钢箱梁结构、大跨度钢桁梁结构、钢管或钢箱拱结构和多种钢制叠合梁结构等。其中大型钢桁梁桥结构以其受力好、质量轻,满足较高强度和刚度要求等优点,成为跨越河流、深沟峡谷的理想桥型。大跨度钢桁梁桥施工安全监测与分析是连接设计与施工的关键步骤,对桥梁施工安全至关重要。提高大跨度钢桁梁桥施工安全监测与分析技术水平将带来巨大的经济效益和工程价值。本文结合具体工程项目,针对大跨度钢桁梁桥施工监测过程,重点分析了大跨度钢桁梁桥施工过程的线形与应力变化,评估桥梁安全状态,建立了桥梁有限元模型,并做了一些优化修正。主要内容包括:1.大跨度钢桁梁大桥测量手段的研究。结合大跨度钢桁梁桥的具体情况,将传统测量技术、电子测量技术、自动化测量技术综合比较,分析不同测量手段的优劣,依据“优劣互补、精确可靠”的原则选择测量手段。2.钢桁梁桥的施工监测方案概括总结。结合国内外钢桁梁工程的发展状况,对大跨度钢桁梁施工监控的理论、原则、方法、目的等做了简要概述。结合项目具体情况制订了施工监测方案,对监测过程中的几个重要参数进行了测量数据分析研究。3.运用有限元法,建立有效的全桥有限元模型。通过使用大型通用有限元软件ABAQUS/Standard对桥梁落架、旋转、平移、落梁各阶段做了应力和线形变化分析,结合精确的测量手段达到安全监测的目的。模型修正后能在误差允许范围内提供桥梁形态变化预测,推演钢桁梁桥在落架工况下挠度变化。结果显示,该模型能较好预测自然条件下钢桁梁挠度变化,符合实际变化规律,从而对确保施工安全有较大帮助。
[Abstract]:Bridge is an important part of transportation network. At present, the rapid development of engineering construction in China, the emergence of long-span bridges in endlessly, put forward a new height and requirements for the quality level of bridge engineering. Since -50s, At present, the main structural forms of steel bridge at home and abroad include steel box girder structure, large span steel truss beam structure. Steel tube or steel box arch structure and a variety of steel composite beam structures, among which large steel truss girder bridge structure has become a cross river because of its advantages of good force, light weight, high strength and rigidity, etc. The construction safety monitoring and analysis of long span steel truss girder bridge is the key step of connecting design and construction. It is of great importance to bridge construction safety. Improving the technical level of construction safety monitoring and analysis of long-span steel truss bridge will bring great economic benefits and engineering value. Combined with specific project, this paper aims at the construction monitoring process of long-span steel truss bridge. In this paper, the linear and stress changes of long span steel truss bridge are analyzed, the safety state of the bridge is evaluated, and the finite element model of the bridge is established. Some optimization amendments are made. The main contents include: 1. Research on measuring means of long span steel truss bridge. Combined with the concrete situation of long span steel truss bridge, the traditional measurement technology, electronic measurement technology and automatic measurement technology are compared. This paper analyzes the merits and demerits of different measuring methods, selects the measuring means according to the principle of "complementary advantages and disadvantages, accurate and reliable", summarizes the construction monitoring scheme of steel truss bridge, and combines the development of steel truss beam engineering at home and abroad. In this paper, the theory, principle, method and purpose of construction monitoring of large-span steel truss beam are briefly summarized. In this paper, some important parameters in the monitoring process are analyzed and studied. 3. Using finite element method, an effective finite element model of the bridge is established. By using the large-scale universal finite element software ABAQUS/Standard, the bridge falls, rotates, and moves the bridge. The stress and linear variation of the falling beam are analyzed, and the safety monitoring is achieved by means of accurate measurement. The modified model can provide the prediction of the bridge shape change within the allowable error range. The results show that the model can predict the deflection change of steel truss beam under natural conditions, which is in line with the actual variation law, and thus has great help to ensure the construction safety.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U446

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